<?php
$units = array(
      "en" => array("mm", "cm", "dm", "m", "km"),
      "zh-cn" => array("毫米", "厘米", "分米", "米", "千米")
);

$errors = array(
      "en" => array(
      					"Error!",
      					"Error: The number of Y is different from X's!"
      ),
      "zh-cn" => array(
      						"错误！",
      						"错误：数组 Y 的大小与 X 的不同！"
      )
);

?>